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RELATED PARTY TRANSACTIONS - Narrative (Details) - Related party - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Related party expenses | $ 4,420 | $ 4,560 | $ 4,305
Front Ocean Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 400 | 226 | 55
Front Ocean Management AS | Advisory and support services |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 700 | 500 | 100
Frontline Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 0 | 0 | 184
Frontline Management AS | Technical management and support services |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 100 | 300 | 500
Seatankers Management Co. Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 115 | 225 | 144
Seatankers Management Co. Ltd | Advisory and support services |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 100 | 200 | 100
Flex LNG Fleet Management AS |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | 3,435 | 3,489 | 3,235
Flex LNG Fleet Management AS | Technical management and support services |  |  |
Related Party Transaction [Line Items] |  |  |
Related party expenses | $ 3,400 | $ 3,500 | $ 3,200

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